REVIEWED: HighDPI support on macOS retina #1510

src/core.c

@@ -3300,7 +3300,7 @@ static bool InitGraphicsDevice(int width, int height)
         // NOTE: This hint only has an effect on platforms where screen coordinates and pixels always map 1:1 such as Windows and X11.
         // On platforms like macOS the resolution of the framebuffer is changed independently of the window size.
         glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);   // Scale content area based on the monitor content scale where window is placed on
-    #if !defined(__APPLE__)
+    #if defined(__APPLE__)
         glfwWindowHint(GLFW_COCOA_RETINA_FRAMEBUFFER, GLFW_TRUE);
     #endif
     }
@@ -3309,6 +3309,7 @@ static bool InitGraphicsDevice(int width, int height)
 
     if (CORE.Window.flags & FLAG_MSAA_4X_HINT)
     {
+        // NOTE: MSAA is only enabled for main framebuffer, not user-created FBOs
         TRACELOG(LOG_INFO, "DISPLAY: Trying to enable MSAA x4");
         glfwWindowHint(GLFW_SAMPLES, 4);   // Tries to enable multisampling x4 (MSAA), default is 0
     }
@@ -4067,11 +4068,15 @@ static bool InitGraphicsDevice(int width, int height)
 #if defined(PLATFORM_DESKTOP)
     if ((CORE.Window.flags & FLAG_WINDOW_HIGHDPI) > 0)
     {
+        // NOTE: On APPLE platforms system should manage window/input scaling and also framebuffer scaling
+        // Framebuffer scaling should be activated with: glfwWindowHint(GLFW_COCOA_RETINA_FRAMEBUFFER, GLFW_TRUE);
+    #if !defined(__APPLE__)
         glfwGetFramebufferSize(CORE.Window.handle, &fbWidth, &fbHeight);
 
         // Screen scaling matrix is required in case desired screen area is different than display area
         CORE.Window.screenScale = MatrixScale((float)fbWidth/CORE.Window.screen.width, (float)fbHeight/CORE.Window.screen.height, 1.0f);
-    #if !defined(__APPLE__)
+        
+        // Mouse input scaling for the new screen size
         SetMouseScale((float)CORE.Window.screen.width/fbWidth, (float)CORE.Window.screen.height/fbHeight);
     #endif
     }